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Investments (Tables)
 6 Months Ended
Dec. 29, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Short-term Investments by Type
(in millions of U.S. Dollars)
December 29, 2024
 Amortized CostGross Unrealized GainsGross Unrealized LossesCredit Loss AllowanceEstimated Fair Value
U.S. treasury securities$338.5 $0.4 ($0.1)$— $338.8 
Corporate bonds357.5 0.6 (3.1)— 355.0 
Municipal bonds85.9 0.1 (1.0)— 85.0 
Certificates of deposit12.0 — — — 12.0 
Total short-term investments$793.9 $1.1 ($4.2)$— $790.8 
 June 30, 2024
(in millions of U.S. Dollars)
Amortized CostGross Unrealized GainsGross Unrealized LossesCredit Loss AllowanceEstimated Fair Value
U.S. treasury securities$553.3 $— ($0.6)$— $552.7 
Corporate bonds423.5 0.2 (6.7)— 417.0 
Municipal bonds102.8 — (2.0)— 100.8 
Certificates of deposit31.5 — — — 31.5 
Commercial paper16.7 — — — 16.7 
U.S. agency securities10.0 — — — 10.0 
Total short-term investments$1,137.8 $0.2 ($9.3)$— $1,128.7 
Schedule of Gross Unrealized Losses and Fair Value of Short-term Investments by Type and Length of Time The following tables present the gross unrealized losses and estimated fair value of the Company’s short-term investments, aggregated by investment type and the length of time that individual securities have been in a continuous unrealized loss position (in millions of U.S. Dollars):
December 29, 2024
Less than 12 MonthsGreater than 12 MonthsTotal
Fair ValueUnrealized LossFair ValueUnrealized LossFair ValueUnrealized Loss
Corporate bonds$100.1 ($0.6)$77.9 ($2.6)$178.0 ($3.2)
U.S. treasury securities26.0 (0.1)30.6 — 56.6 (0.1)
Municipal bonds33.8 (0.3)29.0 (0.7)62.8 (1.0)
Total$159.9 ($1.0)$137.5 ($3.3)$297.4 ($4.3)
Number of securities with an unrealized loss70 48 118 
June 30, 2024
Less than 12 MonthsGreater than 12 MonthsTotal
Fair ValueUnrealized LossFair ValueUnrealized LossFair ValueUnrealized Loss
Corporate bonds$135.2 ($0.2)$183.4 ($6.5)$318.6 ($6.7)
U.S. treasury securities507.4 (0.4)35.9 (0.2)543.3 (0.6)
Municipal bonds9.0 — 74.3 (2.0)83.3 (2.0)
U.S. agency securities14.9 — 10.0 — 24.9 — 
Total$666.5 ($0.6)$303.6 ($8.7)$970.1 ($9.3)
Number of securities with an unrealized loss141 66 207 
Schedule of Contractual Maturities of Short-term Investments by Type
The contractual maturities of short-term investments as of December 29, 2024 were as follows:
(in millions of U.S. Dollars)Within One YearAfter One, Within Five YearsAfter Ten YearsTotal
U.S. treasury securities$308.2 $30.6 $— $338.8 
Corporate bonds254.2 100.8 — 355.0 
Municipal bonds42.0 40.6 2.4 85.0 
Certificates of deposit12.0 — — 12.0 
Total short-term investments$616.4 $172.0 $2.4 $790.8